The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/ibcs2/ibcs2_util.h

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    1 /*-
    2  * Copyright (c) 1994 Christos Zoulas
    3  * Copyright (c) 1995 Frank van der Linden
    4  * Copyright (c) 1995 Scott Bartram
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  * from: svr4_util.h,v 1.5 1994/11/18 02:54:31 christos Exp
   30  * from: linux_util.h,v 1.2 1995/03/05 23:23:50 fvdl Exp
   31  *
   32  * $FreeBSD: releng/6.1/sys/i386/ibcs2/ibcs2_util.h 141488 2005-02-07 22:02:18Z jhb $
   33  */
   34 
   35 /*
   36  * This file is pretty much the same as Christos' svr4_util.h
   37  * (for now).
   38  */
   39 
   40 #ifndef _IBCS2_UTIL_H_
   41 #define _IBCS2_UTIL_H_
   42 
   43 /*
   44  * XXX the inlines have obnoxious prerequisites, only some of which are
   45  * included here.
   46  */
   47 #include <vm/vm.h>
   48 #include <vm/pmap.h>
   49 #include <machine/vmparam.h>
   50 #include <sys/exec.h>
   51 #include <sys/sysent.h>
   52 #include <sys/proc.h>
   53 #include <sys/uio.h>
   54 
   55 static __inline caddr_t stackgap_init(void);
   56 static __inline void *stackgap_alloc(caddr_t *, size_t);
   57 
   58 static __inline caddr_t
   59 stackgap_init()
   60 {
   61 #define szsigcode (*(curthread->td_proc->p_sysent->sv_szsigcode))
   62         return (caddr_t)(PS_STRINGS - szsigcode - SPARE_USRSPACE);
   63 }
   64 
   65 static __inline void *
   66 stackgap_alloc(sgp, sz)
   67         caddr_t *sgp;
   68         size_t   sz;
   69 {
   70         void    *p = (void *) *sgp;
   71         sz = ALIGN(sz);
   72         if (*sgp + sz > (caddr_t)(PS_STRINGS - szsigcode))
   73                 return NULL;
   74         *sgp += sz;
   75         return p;
   76 }
   77 
   78 #ifdef DEBUG_IBCS2
   79 #define DPRINTF(a)      printf a;
   80 #else
   81 #define DPRINTF(a)
   82 #endif
   83 
   84 extern const char ibcs2_emul_path[];
   85 
   86 int     ibcs2_emul_find(struct thread *, char *, enum uio_seg, char **, int);
   87 
   88 #define CHECKALT(td, upath, pathp, i)                                   \
   89         do {                                                            \
   90                 int _error;                                             \
   91                                                                         \
   92                 _error = ibcs2_emul_find(td, upath, UIO_USERSPACE, pathp, i); \
   93                 if (*(pathp) == NULL)                                   \
   94                         return (_error);                                \
   95         } while (0)
   96 
   97 #define CHECKALTEXIST(td, upath, pathp) CHECKALT(td, upath, pathp, 0)
   98 #define CHECKALTCREAT(td, upath, pathp) CHECKALT(td, upath, pathp, 1)
   99 
  100 #ifdef SPX_HACK
  101 int     spx_open(struct thread *td);
  102 #endif
  103 
  104 #endif /* !_IBCS2_UTIL_H_ */

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